Initial commit

4 files changed, 54 insertions, 0 deletions

diff --git a/day1/.gitignore b/day1/.gitignore
new file mode 100644
index 0000000..a7de3a7
--- /dev/null
+++ b/day1/.gitignore
@@ -0,0 +1,3 @@
+/target
+**/*.rs.bk
+input.txt
diff --git a/day1/Cargo.lock b/day1/Cargo.lock
new file mode 100644
index 0000000..7441fae
--- /dev/null
+++ b/day1/Cargo.lock
@@ -0,0 +1,4 @@
+[[package]]
+name = "day1"
+version = "0.1.0"
+
diff --git a/day1/Cargo.toml b/day1/Cargo.toml
new file mode 100644
index 0000000..1084a3f
--- /dev/null
+++ b/day1/Cargo.toml
@@ -0,0 +1,6 @@
+[package]
+name = "day1"
+version = "0.1.0"
+authors = ["Jan Tuomi <jan.tuomi@eficode.com>"]
+
+[dependencies]
diff --git a/day1/src/main.rs b/day1/src/main.rs
new file mode 100644
index 0000000..f9b93ce
--- /dev/null
+++ b/day1/src/main.rs
@@ -0,0 +1,41 @@
+use std::env;
+use std::io::BufReader;
+use std::io::BufRead;
+use std::fs::File;
+use std::process;
+
+fn main() {
+  let args: Vec<String> = env::args().collect();
+  if args.len() != 2 {
+    println!("Wrong number of arguments. Provide just a file name.");
+    process::exit(1);
+  }
+  let filename = &args[1];
+  println!("Using file {} as input.", filename);
+  let f = match File::open(filename) {
+    Ok(file) => file,
+    Err(e) => {
+      println!("Failed to open file {}. {:?}", filename, e);
+      process::exit(1);
+    }
+  };
+  let file = BufReader::new(&f);
+
+  let mut diffs: Vec<i32> = Vec::new();
+  for line in file.lines() {
+    let l = line.unwrap();
+    let res = l.parse::<i32>();
+    match res {
+      Ok(value) => {
+        diffs.push(value);
+      }
+      Err(e) => {
+        println!("{:?}. l: {:?}", e, l);
+        process::exit(1);
+      }
+    }
+  }
+
+  let result: i32 = diffs.iter().fold(0, |acc, x| acc + x);
+  println!("{}", result);
+}